Have seen the entire documentary and now the show. The show surpassed my expectations with the casting of Michael Barnett (who is half the reason to watch the documentary).
The adoption process in the US is extremely difficult (lots of background checks, home visits, letters of recommendation, follow-ups, etc) and the circumstances leading to the adoption of Natalia were extremely shady by American standards. I believe that the adoption agency responsible for that adoption closed quickly following it. Placing a child for a second adoption in the US is also very rare and difficult, usually involving what is ultimately a private adoption rather than one that is through the foster system and typical protocol.
The Natalia Grace story is not a black and white situation and it's hard to know who to believe at times, but I do believe that this was a child with Reactive Attachment Disorder and that it was too much for the Barnetts and the family before them. It's really too bad we never got to know more about that first American family who adopted her but they have never wavered in their silence.
The Barnetts should have given her back up for adoption rather than re-aged her, in my humble opinion. It's all very sad. But I do think that Michael had a good heart but was/is a deeply troubled person.
The Manses are opportunists and even worse than the Barnetts in most ways. Natalia is now with the DePauls, where she should have been all along (instead of ending up with the Barnetts.) It's a tragedy that her first American family didn't allow the DePauls to take her as planned.